Physics Letters B
We present first measurements of the evolution of the differential transverse momentum correlation function, C, with collision centrality in Au + Au interactions at √sNN = 200 GeV. This observable exhibits a strong dependence on collision centrality that is qualitatively similar to that of number correlations previously reported. We use the observed longitudinal broadening of the near-side peak of C with increasing centrality to estimate the ratio of the shear viscosity to entropy density, η / s , of the matter formed in central Au + Au interactions. We obtain an upper limit estimate of η / s that suggests that the produced medium has a small viscosity per unit entropy.
Original Publication Citation
Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Alford, J., . . . Zoulkarneeva, Y. (2011). Evolution of the differential transverse momentum correlation function with centrality in Au + Au collisions at √sNN = 200 GeV . Physics Letters B, 704(5), 467-473. doi:https://doi.org/10.1016/j.physletb.2011.09.075
Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Alekseev, I.; Alford, J.; Anderson, B. D.; Anson, C. D.; Arhipkin, D.; Averichev, G. S.; Bültmann, S.; and Plyku, D., "Evolution of the Differential Transverse Momentum Correlation Function with Centrality in Au + Au Collisions at √sNN = 200 GeV" (2011). Physics Faculty Publications. 99.